Boiler-furnace



(No Model.)v

H. OOWBLL.

BOILER PURNAGE.

N0. 275,805. Patented Apr.`17,1883.

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` ITED STATES PATENT OFFICE.

HIRAM COWELL, OF ZANESVILLE, OHIO.

BOILER-FURNACE.

SPECIFICATION formingA part of Letters Patent No. 275,805, dated April 17, 1883. Application filed December 22, 1882. (No model.)

To all whom it may concern:

Be it known that I, HIRAM COWELL, of Zanesville, in the county of Muskingum and State of Ohio, have invented a certain new and Improved Boiler-Furnace; and I do hercby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figure l is a side elevation of a furnace constructed in accordance with my invention. Fig. 2 is a longitudinal sectional view of the same.

Similar letters of reference in the several figures denote the same parts.

My invention relates particularly to improvements upon the furnace for which a patent was granted me January 20,1880,num bered 223,635; and it consists in certain novel features of construction which I will first describe and then point out in the claims.

In the accompanying drawings, A represents a steam-boiler; B, the fire-box of the furnace, having the grate O and a low wall, C, at its back. Behind the wall C is a perforated wall, F, arched at its bottom and built up to the boiler, as shown. Between the wall C and wall F is a space, G, to which access may be had through an opening at the end, closed by slide, E, for the purpose of removing soot and cinders from said space when occasion requires. Still farther back under the boiler is a second perforated wall, H, similar to F, ex-

' cept that it is not arched at the bottom. The

space N, between the two walls F and H, constitutes a combustion-chamber. Behind the second perforated wall H is a second combustion-chamber, K, containing a low deectingwall, J, as shown.

Extending across the space N, between the perforated walls F and H, just below the lower line of perforations in said walls, is a grating, G', composed preferably of fire-brick with intervening air-spaces between them, and across the space between the perforated wall H and low wall J is another similar grating, I'.

Fresh external air can be admitted to the spaces G and I, below the gratings G' and I', through suitable openin gs controlled by valves G2 and I2, respectively.

In the operation of the furnace the smoke and other volatile products of combustion pass from the re-box over the low wall C down into the space G, and a portion passes through perforatious in the wall F, while another portion passes under the arch of said wall and into the space N under the grating G', where, commingling with the fresh external air admitted to said space N, they pass up through the grating, and, meeting with the portion passed through the perforation of wall F, pass together through the perforations of -the Wall H. Here they are further commingled with asupply of fresh air admitted in the space I, and, rushing up through the grating I and striking the wall J, are deflected into the combastion-chamber K and pass thence under the boiler and through the ues and out.

The various walls and gratings through which the volatile products pass are very highly heated, and divide and break up said products and whirl them about and thoroughly commingle them with the fresh air supplied 'at the various points, and effect their most thorough combustion, thus completely utilizing them and greatly increasing the heating capacity ofthe furnace.

The perforations fh in the walls F and H, respectively, are preferably made taperingfrom front to rear, so that the smoke, o., shall enter them freely, but be compressed at the instant of discharge, thereby causing a more rapid commingling with the fresh-air supply; but said perforations may be made with parallel sides or in any other preferred form, if desired.

The low wall G, at the back ofthe iirebox, performs the important function of preventing the fuel from being banked against the perforated wall F, so as to close the perforations therein, as would be the case with a furnace constructed on the plan of my former patent, were not great care exercised.

Having thus described my invention, I claim as newl. In the herein-described furnace, the combination of the low wall C, the arched perforated wall F, the perforated wall H, the airinlets G2 I2 behind walls F H, respectively, and the deilecting-wall J, substantially as described. y

2. The combination, with the low wall O, the perforated wall F, arched at the bottom, with the second perforated wall, H, deflecting-wall J, and the gratings G I, and the several air-inlets, the whole arranged substantially as described, for the purpose specified.

Witnesses: HIRAM COWELL.

H. S. MOODY, E. FOGLE.

IOO 

